/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.security.oidc.provider;

import static org.hisp.dhis.external.conf.ConfigurationKey.OIDC_PROVIDER_GOOGLE_CLIENT_ID;
import static org.hisp.dhis.external.conf.ConfigurationKey.OIDC_PROVIDER_GOOGLE_CLIENT_SECRET;
import static org.hisp.dhis.external.conf.ConfigurationKey.OIDC_PROVIDER_GOOGLE_MAPPING_CLAIM;
import static org.hisp.dhis.external.conf.ConfigurationKey.OIDC_PROVIDER_GOOGLE_REDIRECT_URI;

import java.util.Map;
import java.util.Objects;
import java.util.Properties;
import java.util.Set;
import org.apache.commons.lang3.StringUtils;
import org.hisp.dhis.security.oidc.DhisOidcClientRegistration;
import org.hisp.dhis.security.oidc.GenericOidcProviderConfigParser;
import org.springframework.security.config.oauth2.client.CommonOAuth2Provider;
import org.springframework.security.oauth2.client.registration.ClientRegistration;

/**
 * @author Morten Svanæs <msvanaes@dhis2.org>
 */
public class GoogleProvider extends AbstractOidcProvider {
  public static final String REGISTRATION_ID = "google";

  private GoogleProvider() {
    throw new IllegalStateException("Utility class");
  }

  public static DhisOidcClientRegistration parse(Properties config) {
    Objects.requireNonNull(config, "DhisConfigurationProvider is missing!");

    Map<String, Set<String>> allKeysByProvider =
        GenericOidcProviderConfigParser.extractKeysGroupByProvider(config);

    // Skip parsing if there is no keys matching REGISTRATION_ID
    if (!allKeysByProvider.containsKey(REGISTRATION_ID)
        || allKeysByProvider.get(REGISTRATION_ID).isEmpty()) {
      return null;
    }

    Set<String> googleKeys = allKeysByProvider.get(REGISTRATION_ID);

    Map<String, Map<String, String>> externalClientConfigs =
        GenericOidcProviderConfigParser.getAllExternalClients(config, REGISTRATION_ID, googleKeys);

    ClientRegistration clientRegistration = buildClientRegistration(config);

    if (clientRegistration == null) {
      return null;
    }

    return DhisOidcClientRegistration.builder()
        .clientRegistration(clientRegistration)
        .mappingClaimKey(
            StringUtils.firstNonBlank(
                config.getProperty(OIDC_PROVIDER_GOOGLE_MAPPING_CLAIM.getKey()), "email"))
        .loginIcon("/dhis-web-commons/oidc/btn_google_light_normal_ios.svg")
        .loginIconPadding("0px 0px")
        .loginText("login_with_google")
        .externalClients(externalClientConfigs)
        .build();
  }

  private static ClientRegistration buildClientRegistration(Properties config) {
    String clientId = config.getProperty(OIDC_PROVIDER_GOOGLE_CLIENT_ID.getKey());
    String clientSecret = config.getProperty(OIDC_PROVIDER_GOOGLE_CLIENT_SECRET.getKey());

    if (clientId.isEmpty()) {
      return null;
    }

    if (clientSecret.isEmpty()) {
      throw new IllegalArgumentException("Google client secret is missing!");
    }

    return CommonOAuth2Provider.GOOGLE
        .getBuilder(REGISTRATION_ID)
        .clientId(clientId)
        .clientSecret(clientSecret)
        .redirectUri(
            StringUtils.firstNonBlank(
                config.getProperty(OIDC_PROVIDER_GOOGLE_REDIRECT_URI.getKey()),
                DEFAULT_REDIRECT_TEMPLATE_URL))
        .build();
  }
}
